damn girl. She is pretty and great to talk to but... I suggested a new codec the other day and it seems she didn't do it, but before i read your reply she found one and downloaded and installed it. She now claims huge credit for fixing it... Sorry for bugging you guys and thanks for the help Androme2.

Incorrect.
DVDs use mpeg-2. That is what you want a codec for.
Usually you have a piece of software which comes with the computer and provides it
reinstalling media player wont do anything
Installing vlc however might do, iirc it comes with its own codecs

Phils right, DVD requires a MPEG-2 decoder which due to needing a licence generally requires you to have 'obtained' a piece of commercial DVD software.

Now if it was working before the chances are her computer or a component of the computer came with a DVD player, most of the main PC manufacturers ships any computer containg a dvd drive with something like PowerDVD or WinDVD so she just needs to install that. If she isn't sure check the discs that various discs that came with the computer/components

Sorry I probably should have been more specific.
Assuming you still have ffdshow installed, open video decoder configuration from your start menu. Go into the codecs list and find mpeg2 in the list. If you select the mpeg2 row with the mouse then you'll see a button appear at the bottom of the list that says "DVD Decoding (not working yet)".

Tick the button!

Apply everything and then it should work. It's a little quirky sometimes but usually it's fine.